package 实践.class_01;

import java.util.Scanner;

public class Demo4 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int all = sc.nextInt();
        double x = sc.nextInt();
        double y = sc.nextInt();
        int z =(int) (all-(y/x));
        System.out.println(z);
    }
}
